Datasheet LTC4015 (Analog Devices) - 9

LTC4015
ELECTRICAL CHARACTERISTICS The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 2), DVCC = 3.3V, UVCLFB = 1.5; CELLS1 = INTVCC; EQ, MPPT, CELLS0, CELLS2, CHEM0, CHEM1 = 0; RT = 95.3k; RCCREF = 301k, RNTCBIAS = RNTC = 10k; BATSENS = CSN = CSP; DRVCC = INTVCC; SYS = CLP = CLN. Conditions: Charging; VIN = 12V, SYS = 12V, BATSENS = 7.4V …..Battery Only; VIN = 0V, SYS = 8.4V, BATSENS = 8.4V SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tHD(DAT(OUT)) Output Data Hold Time 0 900 ns tHD)DAT(IN)) Input Data Hold Time 0 ns tSU(DAT) Data Set-Up Time 100 ns tSP Input Spike Suppression Pulse Width 50 ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 5:
The current limit features of this part are intended to protect the may cause permanent damage to the device. Exposure to any Absolute IC from short term or intermittent fault conditions. Continuous operation Maximum Rating condition for extended periods may affect device above the maximum specified pin current may result in device degradation reliability and lifetime. or failure.
Note 2:
The LTC4015 is tested under pulsed load conditions such that TJ ≈
Note 6:
Measurement error is the magnitude of the difference between the TA. The LTC4015E is guaranteed to meet specifications from 0°C to 85°C actual measured value and the ideal value. Error for VCLP-CLN and VCSP-CSN junction temperature. Specifications over the –40°C to 125°C operating is expressed in μV, a conversion to an equivalent current may be made by junction temperature range are assured by design, characterization and dividing by the sense resistors, RSNSI and RSNSB, respectively. correlation with statistical process controls. The LTC4015I is guaranteed
Note 7:
VCHARGE is the battery charge voltage (or CV, constant-voltage) over the –40°C to 125°C operating junction temperature range. Note that target. VBAT is the battery voltage. Dynamic supply current is higher due the maximum ambient temperature consistent with these specifications to the gate charge being delivered at the switching frequency. See the is determined by specific operating conditions in conjunction with board Applications Information section. layout, the rated package thermal impedance and other environmental
Note 8:
V factors. The junction temperature (T IN, or VBAT for battery only operation, may be connected to any J, in °C) is calculated from the ambient suitable DC power source from 2.8V to 35V such that the voltage at V temperature (T SYS A, in °C) and power dissipation (PD, in Watts) according to is high enough to allow INTV the formula: CC to support the desired mode of operation. In order for the telemetry system to operate, INTVCC must exceed the T telemetry undervoltage lockout (V J = TA + (PD • θJA) INTVCC_TUVLO). In order for the battery where θ charger to operate, INTV JA = 34°C/W for the UHF package. CC must exceed the charger undervoltage lockout
Note 3:
The LTC4015 includes overtemperature protection that is (VINTVCC_CUVLO). Allowing for 0.3V of drop from VIN to INTVCC, these intended to protect the device during momentary overload conditions. modes require a minimum input voltage of 3.1V and 4.35V, respectively. The maximum rated junction temperature will be exceeded when this Additionally the VIN to VBATSENS (VIN_DULVO) differential must also be protection is active. Continuous operation above the specified absolute satisfied for charging. maximum operating junction temperature may impair device reliability or
Note 9:
Chemistry selection is made using the CHEM1 and CHEM0 pins. permanently damage the device. These are three-state pins used by the LTC4015 to select of one of nine
Note 4:
UVCLFB is internally clamped above the maximum UVCLFB chemistry specific charging algorithms. These pins should be hard wired regulation point (2.5V at 200µA nominally). Maximum input current must to GND(L), INTVCC(H), or left open (Z > 1000kΩ). be limited to 200µA when this clamp is reached.
Note 10:
ICHARGE is the battery charge current (or CC, constant-current) target. ICHG is the charge current when charging.
Note 11:
Charge voltage tolerance is VCHARGE(TOL) which is specified at the beginning of the electrical table. The LTC4015 is not a substitute for pack protection! The 4015 does not monitor or balance individual cells – the full stack voltage is divided by number of cells for simplicity only. 4015fb For more information www.linear.com/LTC4015 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Data Sheet Conventions Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram I2C Timing Diagram Operation Applications Information Register Description DETAILED Register Descriptions Typical Applications Package Description Revision History Typical Application Related Parts